ignition DAEWOO LACETTI 2004 Service Repair Manual

AISIN AUTOMATIC TRANSAXLE 5A2 – 77
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0753
SHIFT SOLENOID 1 (SS1) ELECTRICAL
Conditions for Setting the DTC
S TCM detects that the ON signal of the Shift Sole-
noid 1 (SS1) monitor during 0.5 seconds when SS1
driver outputs the OFF signal.(When the SS1 circuit
is open or short to battery).
S TCM detects that the OFF signal of the Shift Sole-
noid 1 (SS1) monitor during 0.3 seconds when SS1
driver outputs the ON signal.(When the SS1 circuit
is short to ground).
S The above detection 2 times at shifting continuous-
ly.
Action Taken When the DTC Sets
S TCM will request the illumination of MIL and store
DTC when TCM detects a failure on the first ignition
cycle.
S No lockup control
S No engine torque reduction control
S No engagement pressure control
S No timing solenoid control for N–D
S No self–learning control
S After failure decision : emergency modeTCM Shifting Pattern (Range : D)
Normal
SS1 FAIL
GearSS1SS2GearSS1SS2
1 stONON3 rdFAILOFF
2 ndONOFF3 rdFAILOFF
3 rdOFFOFF3 rdFAILOFF
4 thOFFON4 thFAILON
Conditions for Clearing the DTC
S The TCM turns off the MIL when no further failures
detected for three consecutive ignition cycles.
S The scan tool can clear the DTC from the TCM his-
tory.
S The TCM clears the DTC from the TCM history
memory after forty consecutive warm up cycles
without fault.
S TCM detects the ON signal of the SS1 monitor dur-
ing 160 ms when SS1 driver outputs the ON signal
and TCM detects the OFF signal of the SS1 moni-
tor during 160 ms when SS1 driver outputs the
OFF signal.

5A2 – 78IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
Cause of Failure
S Wiring harness or connector between Shift Sole-noid 1 (SS1) and TCM
S SS1
S TCM
DTC P0753 Shift Solenoid 1 (SS1) Electrical
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform one vehicle drive cycle.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P0753 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
31. Turn the ignition OFF.
2. Inspect the resistance between the vehicle har-
ness and Shift Solenoid 1 (SS1). Refer to ”Unit
Inspection” in this section.
3. Disconnect the TCM connector (X–1) and in-
spect the resistance between the terminal A16
and A23.
Is the measurement within the specified value?20°C (68°F)
11–16 WGo to Step 4Go to Step 5
41. Estimate the failure of between the vehicle wir-
ing harness connector and TCM.
2. Inspect the connector. Refer to ”Wiring Har-
ness and Connector Inspection” in this section.
3. Inspect the connection condition between the
connectors (C–1).
Is the connection condition OK?–Go to Step 6Repair the wir-
ing harness
connectors.
51. Estimate the failure of between the vehicle har-
ness and SS1.
2. Disconnect the connector (X–3) of T/M wire
and inspect the resistance between SS1 con-
nector terminal 5 and ground.
Is the measurement within the specified value?20°C (68°F)
11–16 WGo to Step 7Go to Step 8

5A2 – 80IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0756
SHIFT SOLENOID 2 (SS2) STUCK OFF
Conditions for Setting the DTC
S Shift Solenoid 2 (SS2) is stuck ON/OFF.
S D range selected
S Engine water normal temperature
S 20 seconds have passed since the transaxle was
placed in D.
S Engine revolution is 600 rpm or greater.
S No failure of output speed sensor / input speed
sensor / engine revolution / water temperature sig-
nal / solenoid electrical / ranger sensor / throttle
signalAction Taken When the DTC Sets
S TCM will request the illumination of MIL and store
DTC when TCM detects failures on two consecu-
tive ignition cycles.
Conditions for Clearing the DTC
S The TCM turns off the MIL when no further failures
detected for three consecutive ignition cycles.
S The scan tool can clear the DTC from the TCM his-
tory.
S The TCM clears the DTC from the TCM history
memory after forty consecutive warm up cycles
without fault.
Cause of Failure
S Shift Solenoid 2 (SS2)
S Inside Valve Body
S TCM

AISIN AUTOMATIC TRANSAXLE 5A2 – 81
DAEWOO V–121 BL4
DTC P0756 Shift Solenoid 2 (SS2) Stuck Off
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform two vehicle drive cycles.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P0756 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
31. Turn the ignition OFF.
2. Replace the master TCM and perform simula-
tion test again under user condition.
Is DTC P0756 reappeared?–Go to Step 4Replace the
TCM.
41. Estimate the failure of Shift Solenoid 2 or inter-
nal valve body.
2. Inspect the SS2. Refer to ”Unit Inspection” in
this section.
Is the condition of SS2 OK?–Replace the
valve body as-
sembly.Replace Shift
Solenoid 2
(SS2).

5A2 – 82IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0758
SHIFT SOLENOID 2 (SS2) ELECTRICAL
Conditions for Setting the DTC
S TCM detects that the ON signal of the Shift Sole-
noid 2 (SS2) monitor during 0.5 seconds when SS2
driver outputs the OFF signal.(When the SS2 circuit
is open or short to battery).
S TCM detects that the OFF signal of the Shift Sole-
noid 2 (SS2) monitor during 0.3 seconds when SS2
driver outputs the ON signal.(When the SS2 circuit
is short to ground).
S The above detection 2 times at shifting continuous-
ly.
Action Taken When the DTC Sets
S TCM will request the illumination of MIL and store
DTC when TCM detects a failure on the first ignition
cycle.
S No lockup control
S No engine torque reduction control
S No engagement pressure control
S No timing solenoid control for N–D
S No self–learning control
S After failure decision : emergency modeTCM Shifting Pattern (Range : D)
Normal
SS2 FAIL
GearSS1SS2GearSS1SS2
1 stONON2 ndONFAIL
2 ndONOFF2 ndONFAIL
3 rdOFFOFF3 rdOFFFAIL
4 thOFFON3 rdOFFFAIL
Conditions for Clearing the DTC
S The TCM turns off the MIL when no further failures
detected for three consecutive ignition cycles.
S The scan tool can clear the DTC from the TCM his-
tory.
S The TCM clears the DTC from the TCM history
memory after forty consecutive warm up cycles
without fault.
S TCM detects the ON signal of the SS2 monitor dur-
ing 160 ms when SS2 driver outputs the ON signal
and TCM detects the OFF signal of the SS2 moni-
tor during 160 ms when SS2 driver outputs the
OFF signal.

AISIN AUTOMATIC TRANSAXLE 5A2 – 83
DAEWOO V–121 BL4
Cause of Failure
S Wiring harness or connector between Shift Sole-noid 2 (SS2) and TCM
S SS2
S TCM
DTC P0758 Shift Solenoid 2 (SS2) Electrical
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform one vehicle drive cycle.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P0758 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
31. Turn the ignition OFF.
2. Inspect the resistance between the vehicle har-
ness and Shift Solenoid 2 (SS2). Refer to ”Unit
Inspection” in this section.
3. Disconnect the TCM connector (X–1) and in-
spect the resistance between the terminal A15
and A23.
Is the measurement within the specified value?20°C (68°F)
11–16 WGo to Step 4Go to Step 5
41. Estimate the failure of between the vehicle wir-
ing harness connector and TCM.
2. Inspect the connector. Refer to ”Wiring Har-
ness and Connector Inspection” in this section.
3. Inspect the connection condition between the
connectors (C–1).
Is the connection condition OK?–Go to Step 6Repair the wir-
ing harness
connectors.
51. Estimate the failure of between the vehicle har-
ness and SS2.
2. Disconnect the connector (X–3) of T/M wire
and inspect the resistance between SS2 con-
nector terminal 10 and ground.
Is the measurement within the specified value?20°C (68°F)
11–16 WGo to Step 7Go to Step 8

AISIN AUTOMATIC TRANSAXLE 5A2 – 85
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0785
TIMING SOLENOID (ST) ELECTRICAL
Conditions for Setting the DTC
S TCM detects that the ON signal of the Timing Sole-
noid (ST) monitor during 0.5 seconds when ST driv-
er outputs the OFF signal.(When the ST circuit is
open or short to battery).
S TCM detects that the OFF signal of the Timing So-
lenoid (ST) monitor during 0.1 seconds when ST
driver outputs the ON signal.(When the ST circuit is
short to ground).
S The above detection 3 times at shifting continuous-
ly.
Action Taken When the DTC Sets
S TCM will request the illumination of MIL and store
DTC when TCM detects a failure on the first ignition
cycle.
S After failure decision : emergency modeConditions for Clearing the DTC
S The TCM turns off the MIL when no further failures
detected for three consecutive ignition cycles.
S The scan tool can clear the DTC from the TCM his-
tory.
S The TCM clears the DTC from the TCM history
memory after forty consecutive warm up cycles
without fault.
S TCM detects the ON signal of the ST monitor dur-
ing 100 ms when ST driver outputs the ON signal
and TCM detects the OFF signal of the ST monitor
during 160 ms when ST driver outputs the OFF sig-
nal.
Cause of Failure
S Wiring harness or connector between Timing Sole-
noid (ST) and TCM
S ST
S TCM

5A2 – 86IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DTC P0785 Timing Solenoid (ST) Electrical
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform one vehicle drive cycle.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P0785 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
31. Turn the ignition OFF.
2. Inspect the resistance between the vehicle har-
ness and Timing Solenoid (ST). Refer to ”Unit
Inspection” in this section.
3. Disconnect the TCM connector (X–1) and in-
spect the resistance between the terminal A24
and A23.
Is the measurement within the specified value?20°C (68°F)
11–16 WGo to Step 4Go to Step 5
41. Estimate the failure of between the vehicle wir-
ing harness connector and TCM.
2. Inspect the connector. Refer to ”Wiring Har-
ness and Connector Inspection” in this section.
3. Inspect the connection condition between the
connectors (C–1).
Is the connection condition OK?–Go to Step 6Repair the wir-
ing harness
connectors.
51. Estimate the failure of between the vehicle har-
ness and ST.
2. Disconnect the connector (X–3) of T/M wire
and inspect the resistance between ST con-
nector terminal 2 and ground.
Is the measurement within the specified value?20°C (68°F)
11–16 WGo to Step 7Go to Step 8
61. Replace the master TCM.
2. Perform the reproducing test under user condi-
tion after confirming no DTC.
Is DTC displayed?–Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)Replace the
TCM

5A2 – 88IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P1781
ENGINE TORQUE SIGNAL ERROR
Conditions for Setting the DTC
S TCM detects that malfunction of engine speed sig-
nal for 2 seconds.
S No DTC U2105
Action Taken When the DTC Sets
S TCM will request the illumination of MIL and store
DTC when TCM detects a failure on the first ignition
cycle.
S No engine torque reduction control
S No engagement pressure control
S No 4th gear
S No self–learning controlConditions for Clearing the DTC
S The TCM turns off the MIL when no further failures
detected for three consecutive ignition cycles.
S The scan tool can clear the DTC from the TCM his-
tory.
S The TCM clears the DTC from the TCM history
memory after forty consecutive warm up cycles
without fault.
Cause of Failure
S Wiring harness or connector between ECM and
TCM
S ECM
S TCM

AISIN AUTOMATIC TRANSAXLE 5A2 – 89
DAEWOO V–121 BL4
DTC P1781 Engine Torque Signal Error
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform one vehicle drive cycles.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector.
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P1781 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector.
31. Turn the ignition OFF.
2. Disconnect the TCM wiring connector and
ECM wiring connector.
3. Measure the resistance between terminal A17
of the TCM wiring connector and terminal 88 of
the ECM wiring connector.
4. Measure the resistance between terminal A7 of
the TCM wiring connector and terminal 57 of
the ECM wiring connector.
Is the resistance within the values shown?0 WGo to Step 5Go to Step 4
4Repair the malfunctioning terminals as necessary.
Is the action complete?–System OK–
51. Turn the ignition ON.
2. Measure the voltage of terminal A17.
3. Measure the voltage of terminal A7.
Is the voltage within the values shown?11–14 vGo to Step 6Go to Step 7
6Repair the malfunctioning terminals as necessary.
Is the action complete?–System OK–
71. Inspect the ”Engine Speed”. Refer to Section
1F, Diagnosis.
Was a problem found?–Refer to Sec-
tion 1F, Diagno-
sis.Go to Step 8
81. Replace the TCM.
2. Turn the ignition OFF.
3. Turn the ignition ON.
4. Check if P1781 DTC is set.
Is the DTC set?–Go to Step 9Go to Step 10